Path: ...!2.eu.feeder.erje.net!feeder.erje.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Roger Hayter Newsgroups: sci.electronics.repair Subject: Re: USB functionality. Date: 9 Mar 2024 22:09:55 GMT Organization: Metazoon Lines: 28 Message-ID: <2219572717.2fe80b82@uninhabited.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=fixed Content-Transfer-Encoding: 8bit X-Trace: individual.net vyRPjoVI0EipIyN/YL27NwYUyIbmanQPBER5b+Xt9u7Fn0N2UK Cancel-Lock: sha1:M98KaAT7sSimci176L5ugdo5qzo= sha256:fcxu+soqAIZYnFVGteWdtXuyyiWczxAF6zyo2uhOoP8= User-Agent: Usenapp for MacOS X-Usenapp: v1.27.2/l - Full License Bytes: 1933 On 9 Mar 2024 at 21:54:51 GMT, "Andrew Smallshaw" wrote: > On 2024-03-09, peter@easthope.ca wrote: >> >> This photo, >> https://commons.wikimedia.org/wiki/File:USB-OTG_Setup_IMG_2342.JPG >> suggests, to me at least, that the phone can be charged while the >> keyboard, mouse and flash store are used. True? > > There are altogether too many unknowns here. Looking at the date > of the photo - 2015 - some phones of that era could support USB > OTG but were unable to supply power to connected peripherals, > meaning you would need a Y cable to supply that separately. Others > could do the job inclusive of power delivery, others couldn't work > in OTG mode at all. Generally you couldn't use OTG and charge > simultaneously, it's a role reversal that early USB wasn't designed > for. > > Things are different with USB-C but of course that is much later. But can even USB-C accept a signal input (keyboard and mouse for instance) and unrelated signal output (audio for instance) on the same physical socket? I ask only out of curiosity. -- Roger Hayter